Function: Background - v3.1

The _background function generates the basic system signals, such as clock signals, clock pulses, date, day of the week, etc.

Dependencies

Type	Name	Version
function	TON_TIME	Siemens FB
function	RUNTIME	Siemens FC
function	RD_LOC_T	Siemens FC

Parameters

Function

Parameter	Declaration	Type	Initial value	Description
OB_initial_call	Input	Bool	0	IR: Map the initial call from OB1.
HW_firstScan	Input	Bool	0	IR: Map the first scan from memory bit.
HW_diagStatusUpdate	Input	Bool	0	IR: Map the diagnostic status update from Memory bit.
HW_clock	Input	Byte	0	IR: Map the clock byte from Memory byte.
HW_TRUE	Input	Bool	1	IR: Map the always TRUE from Memory bit.
HW_FALSE	Input	Bool	0	IR: Map the always FALSE from Memory bit.
clockSource	Input	Bool	0	IR: Clock source: 0=From HW if configured. 1=This function generates it.
TMP_EMRG_BYPASS_TIMEOUT	Input	Time	T#0s	IR: Temporal emergency bypass timeout: =0=Forever >0=Timeout
PROV_TRUE	Output	Bool	1	OR: Provisional always true.
PROV_FALSE	Output	Bool	0	OR: Provisional always false.
clock	Output	Byte	0	OR: Block output if done by HW or SW. See here.
pulse	Output	Byte	0	OR: Get positive edges from clock. See here.
cycleTime	Output	Time	0	OR: Cycle time in milliseconds.
now	Output	DTL	1970-01-01T00:00:00.0	OR: Current date and time.
weekday	Output	Struct	-	OR: Current weekday in bits. See here.
tmp_errorAckn	InOut	Bool	0	IOX: Temporal - Error acknowledgment.
tmp_emrgAckn	InOut	Bool	0	IOX: Temporal - Emergency acknowledgment.
tmp_emrgBypass	InOut	Bool	0	IOX: Temporal - Emergency bypass.
tmp_loadFactory	InOut	Bool	0	IOX: Temporal - Load factory settings.

Weekday Structure

Name	Type	Initial value	Description
d0_nil	Bool	0	1=Null day.
d1_sunday	Bool	0	1=Sunday.
d2_monday	Bool	0	1=Monday.
d3_tuesday	Bool	0	1=Tuesday.
d4_wednesday	Bool	0	1=Wednesday.
d5_thursday	Bool	0	1=Thursday.
d6_friday	Bool	0	1=Friday.
d7_saturday	Bool	0	1=Saturday.

Clock and Pulse

Bit	Period (s)	Frequency (Hz)
.0	0.1	10
.1	0.2	5
.2	0.4	2.5
.3	0.5	2
.4	0.8	1.25
.5	1.0	1
.6	1.6	0.625
.7	2.0	0.5